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indexOf -- greaterThan vs equals
(version: 0)
Comparing performance of:
greaterThan vs equals
Created:
9 years ago
by:
Guest
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Tests:
greaterThan
if('test123'.indexOf('123') > -1) {var t = true;} else {var t = false} if('test123'.indexOf('asd') > -1) {var t = true;} else {var t = false}
equals
if('test123'.indexOf('123') !== -1) {var t = true;} else {var t = false} if('test123'.indexOf('asd') !== -1) {var t = true;} else {var t = false}
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Suite status:
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Test case name
Result
greaterThan
equals
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N/A
Slowest:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what is being tested. **Benchmark Overview** The benchmark, hosted on MeasureThat.net, compares the performance of two JavaScript approaches for checking if a substring exists in a string: `indexOf` with greater-than (`>`) comparison vs. `indexOf` with equals-to-not-found (`!==`) comparison. **What is being compared?** Two test cases are defined: 1. `greaterThan`: This test case uses the `indexOf` method to check if the substring `'123'` exists in the string `'test123'`. The condition is evaluated using a greater-than comparison (`> -1`). If the result is true, `t` is set to `true`. 2. `equals`: This test case uses the `indexOf` method to check if the substring `'123'` exists in the string `'test123'`, but this time with an equals-to-not-found comparison (`!== -1`). If the result is true, `t` is set to `true`. **Options compared** The two approaches are: * Greater-than comparison (`>`) * Equals-to-not-found comparison (`!==`) **Pros and Cons of each approach:** Greater-than comparison (`>`): Pros: * Can be used for finding the index of a specific character in a string, rather than just checking if it exists. * May be faster due to optimization in JavaScript engines. Cons: * Does not account for the case where the substring is an empty string. * If the substring does not exist, the result will always be false. Equals-to-not-found comparison (`!==`): Pros: * Handles cases where the substring is an empty string by returning true if it exists. * Returns false only when the substring does not exist and is not null or undefined. Cons: * May be slower due to additional checks in JavaScript engines. * Requires explicit handling of edge cases. **Library used:** None explicitly mentioned, but the `indexOf` method is a standard JavaScript function. **Special JS feature/syntax:** The benchmark uses the conditional operator (`?:`) in no case, and the `var t = true;`/`var t = false;` syntax for setting variables based on conditions. These are common JavaScript constructs used for simple conditional statements and variable assignments. **Other alternatives:** Alternatives to using `indexOf` include: * Using regular expressions (` RegExp.test()` ) * Implementing your own substring search algorithm. * Using a library or framework that provides optimized string searching functionality, such as jQuery's `fn.index()` method or modern JavaScript libraries like Lodash. Keep in mind that these alternatives might be overkill for simple use cases and may not provide the same performance benefits as using built-in JavaScript methods.
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